SWT/EWT Series
Stackpole Electronics, Inc.
Non-Flammable Edgewound Tubular Wirewound Resistor
Features:
•
•
•
•
•
•
•
•
Resistive Product Solutions
High current capability
RoHS compliant, lead-free and halogen-free
Non-inductive style only available with silicone coating
(NSWT)
Suitable for soldering or thru bolt connections
Wirewound ribbon on ceramic substrate
SWT – Silicone coating provides temperature handling up
to 350ºC
SWTA – Adjustable version
EWT – Vitreous enamel coating provides temperature
handling up to 500ºC
Electrical Specifications
Type/Code
(SWT, EWT, NSWT)
Power Rating (Watts)
@ 25ºC
25
50
100
225
25W
50W
100W
225W
Ohmic Range (Ω) and Tolerance
5%, 10%
SWT
NSWT
0.1 - 30K
0.1 - 100
0.1 - 50K
0.1 - 275
0.1 - 100K
0.12 - 680
0.2 - 130K
0.3 - 1.7K
Dielectric
Strength
VAC
2,500
2,500
2,500
2,500
100
Percent Rated Power (%)
Power Derating Curve:
-55ºC
EWT
1 - 10K
1 - 20K
1 - 50K
1 - 130K
25ºC
80
60
40
20
350ºC
0
-60
0
50
100
150
200
250
300
350
Ambient Temperature (ºC)
Mechanical Specifications
Type/Code
(SWT, EWT, NSWT)
25
50
100
225
OD
0.563
14.30
0.563
14.30
0.752
19.10
1.126
28.60
±
±
±
±
±
±
±
±
ID
0.039
1.00
0.039
1.00
0.039
1.00
0.039
1.00
0.313
7.94
0.313
7.94
0.500
12.70
0.752
19.10
Rev Date: 09/05/2018
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
±
±
±
±
±
±
±
±
L
0.039
1.00
0.039
1.00
0.039
1.00
0.039
1.00
2.008
51.00
4.016
102.00
6.496
165.00
10.512
267.00
1
±
±
±
±
±
±
±
±
F
0.079
2.00
0.079
2.00
0.079
2.00
0.079
2.00
0.472
12.00
0.748
19.00
0.669
17.00
0.709
18.00
±
±
±
±
±
±
±
±
0.039
1.00
0.039
1.00
0.039
1.00
0.039
1.00
E
G
Unit
0.177
4.50
0.315
8.00
0.315
8.00
0.354
9.00
0.079
2.00
0.197
5.00
0.197
5.00
0.197
5.00
inches
mm
inches
mm
inches
mm
inches
mm
www.seielect.com
marketing@seielect.com
SWT/EWT Series
Stackpole Electronics, Inc.
Non-Flammable Edgewound Tubular Wirewound Resistor
Hardware:
•
•
Resistive Product Solutions
Sturdy plated steel brackets, thru-bolts, centering washers, and insulating washers
Brackets provide elongated mounting holes for ease of mounting
Mounting Brackets Mechanical Specifications
Resistor Power Rating
25W
50W
100W
225W
A
B
C
D
E
F
Unit
1.000
25.40
1.000
25.40
1.000
25.40
1.500
38.10
0.750
19.05
0.750
19.05
0.750
19.05
0.875
22.23
0.500
12.70
0.500
12.70
0.500
12.70
1.250
31.75
0.219
5.56
0.219
5.56
0.219
5.56
0.281
7.14
0.438
11.13
0.438
11.13
0.438
11.13
0.563
14.30
0.177
4.50
0.315
8.00
0.315
8.00
0.354
9.00
inches
mm
inches
mm
inches
mm
inches
mm
Bolts and Washers Mechanical Specifications
Metal Centering Washer
Resistor Power Rating
25W
50W
100W
225W
OD
0.563
14.30
0.563
14.30
0.752
19.10
1.126
28.60
Core
Length
2.008
51.00
4.016
102.00
6.496
165.00
10.512
267.00
Rev Date: 09/05/2018
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
Mica Insulating Washer
Bolt
Length
2.500
63.50
4.750
120.65
7.000
177.80
11.250
285.75
Bolt No.
10
10
10
0.25"
2
A
B
C
D
Unit
0.560
14.22
0.560
14.22
0.750
19.05
1.125
28.58
0.190
4.83
0.190
4.83
0.190
4.83
0.250
6.35
0.750
19.05
0.750
19.05
1.000
25.40
1.500
38.10
0.313
7.95
0.313
7.95
0.500
12.70
0.750
19.05
inches
mm
inches
mm
inches
mm
inches
mm
www.seielect.com
marketing@seielect.com
SWT/EWT Series
Stackpole Electronics, Inc.
Non-Flammable Edgewound Tubular Wirewound Resistor
Resistive Product Solutions
Spring Clips Mechanical Specifications
Resistor Power Rating
25W
50W
A
B
C
D
Unit
0.625
15.88
0.625
15.88
0.250
6.35
0.250
6.35
0.469
11.91
0.469
11.91
0.313
7.95
0.313
7.95
inches
mm
inches
mm
RoHS Compliance
Stackpole Electronics has joined the worldwide effort to reduce the amount of lead in electronic components and to meet the various
regulatory requirements now prevalent, such as the European Union’s directive regarding “Restrictions on Hazardous Substances”
(RoHS 3). As part of this ongoing program, we periodically update this document with the status regarding the availability of our
compliant components. All our standard part numbers are compliant to EU Directive 2011/65/EU of the European Parliament as
amended by Directive (EU) 2015/863/EU as regards the list of restricted substances.
RoHS Compliance Status
Description
Package /
Termination
Type
Standard
Series
RoHS
Compliant
Lead-Free Termination
Composition
Lead-Free
Mfg. Effective Date
(Std Product Series)
Lead-Free
Effective Date
Code
(YY/WW)
SWT
Non-Flammable Edgewound Tubular
Wirewound Silicone Coating Resistor
Special
YES
100% Matte Sn
Always
Always
EWT
Non-Flammable Edgewound
Tubular Wirewound Vitreous
Enamel Coating Resistor
Special
YES
100% Matte Sn
Always
Always
Standard
Product
Series
“Conflict Metals” Commitment
We at Stackpole Electronics, Inc. are joined with our industry in opposing the use of metals mined in the “conflict region” of the
eastern Democratic Republic of the Congo (DRC) in our products. Recognizing that the supply chain for metals used in the
electronics industry is very complex, we work closely with our own suppliers to verify to the extent possible that the materials and
products we supply do not contain metals sourced from this conflict region. As such, we are in compliance with the requirements of
Dodd-Frank Act regarding Conflict Minerals.
Compliance to “REACH”
We certify that all passive components supplied by Stackpole Electronics, Inc. are SVHC (Substances of Very High Concern) free
and compliant with the requirements of EU Directive 1907/2006/EC, “The Registration, Evaluation, Authorization and Restriction of
Chemicals”, otherwise referred to as REACH. Contact us for complete list of REACH Substance Candidate List.
Rev Date: 09/05/2018
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
3
www.seielect.com
marketing@seielect.com
SWT/EWT Series
Stackpole Electronics, Inc.
Non-Flammable Edgewound Tubular Wirewound Resistor
Resistive Product Solutions
Environmental Policy
It is the policy of Stackpole Electronics, Inc. (SEI) to protect the environment in all localities in which we operate. We continually
strive to improve our effect on the environment. We observe all applicable laws and regulations regarding the protection of our
environment and all requests related to the environment to which we have agreed. We are committed to the prevention of all forms
of pollution.
How to Order
1
2
3
4
5
6
7
8
9
10
11
12
E
W
T
M
5
0
J
B
2
0
0
R
Product Series
Description
Code
Silicone Coating
SWT
(std)
EWT Vitreous Enamel
Non-inductive
NSWT
Silicone Coating
Type
Description
Code
Std Tab Connection
M
Mounting Hardware
S
Spring Clips
L
Welded Straight Leads
A
Adjustable
Rev Date: 09/05/2018
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
Power
Code Power
25W
25
50W
50
100 100W
225 225W
Tolerance
Code Tol
J
5%
K 10%
Code
B
Packaging
Description
Size
Quantity
Bulk
All Sizes
Each
Resistance Value
Four characters
with the multiplier
used as the
decimal holder.
1 ohm = 1R00
10 Kohm = 10K0
100 Kohm = 100K
4
www.seielect.com
marketing@seielect.com
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